Expert Sleepers Disting mk4 - E-2 AR Envelope & VCA

MIDI Input: Any MIDI note messages received on the MIDI channel set in the Settings trigger the
envelope.
E-2 AR Envelope & VCA
Video
X is trigger input
Y is VCA input
Z sets the envelope times
A is envelope output
B is VCA output
Press Z to trigger
Receives MIDI
Parameter Min Max Default Description
0 0 8 0 Trigger Mode.
1 0 1 0 Z Mode.
2 -40 41 32 Output A Attenuverter.
3 -40 40 32 Output B Attenuverter.
4 -40 40 0 Output A Offset.
5 -40 40 0 Output B Offset.
6 0 32 26 Attack shape.
7 0 32 10 Release shape.
This algorithm is a combined two-stage (attack/release or attack/decay) envelope generator & VCA
(voltage controlled amplifier).
Input X is the trigger input. A signal in excess of 1V will trigger the envelope, according to the
mode set by parameter 0. In trigger mode 0, the envelope will rise to full level and stay there as long
as the input is high (AR mode). In trigger mode 1, the envelope will execute one full attack/decay
cycle in response to a trigger input (AD mode). In trigger mode 2, the envelope will continually
execute attack/decay cycles as long as the trigger is high (looped AD mode).
Trigger modes 3-8 work like modes 1-2 except that the source of the trigger is the tracked envelope
of one of the inputs. Modes 3-5 use input X and modes 6-8 use input Y. So for example mode 6
triggers the envelope generator from the VCA input signal, i.e. the algorithm is behaving as an
'envelope modifier' effect – put a guitar in here for automatic slow swells.
Input Y is the VCA input. The signal here will be multiplied by the envelope and output on output
B.
Z sets the envelope times, according to the mode set by parameter 1. In Z mode 0, the full range of
Z values sweeps from short A & D, through short A & long D, through long A & D, through long A
& short D, and finally back to short A & D. In Z mode 1, Z sets the A & D times to the same value,
from very short times (about 10ms) to very long times (about 8s).
Output A is the envelope CV, and output B is the VCA output as mentioned above. Each has its
own attenuverter parameter, which can attenuate and/or invert the signal. The maximum envelope
level is 10V, with the default parameter value of 32 giving an 8V envelope, which corresponds to
unity gain for the VCA. Each output also has an offset parameter, which can move the whole
envelope up or down by up to 10V.
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